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Image Number K8402-20 With ICP emission spectrometry, ARS plant physiologist Ross Welch can determine the amount of iron and zinc in this liquid obtained by acid-digesting bean seeds. ICP uses the unique characteristic light emitted from an element when heated to 8,000oC in an argon plasma to indicate the element's quantity. Photo by Keith Weller.  640 pixels wide: (k8402-20.jpg)   Please visit our Image Gallery


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